Enzymes are biological molecules (typically proteins) that significantly speed up the rate of virtually all of the chemical reactions that take place within cells.

They are vital for life and serve a wide range of important functions in the body, such as aiding in digestion and metabolism.
Metabolic reactions are of two types
Anabolic reactions or anabolism also called synthesis reactions and the other type is catabolic reactions or catabolism also called breakdown reactions.
Some enzymes help break large molecules into smaller pieces that are more easily absorbed by the body. Other enzymes help bind two molecules together to produce a new molecule. Enzymes are highly selective catalysts, meaning that each enzyme only speeds up a specific reaction.
The molecules that an enzyme works with are called substrates. The substrates bind to a region on the enzyme called the active site.
Properties of enzymes
They are made up of globular protein
they act as a catalyst
They are highly specific
They remained unchanged after a chemical reaction
They decrease the activation energy required to start a chemical reaction.
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